Gas-sensing apparatus

Details Gas-sensing apparatus Gas-sensing apparatus

1988-01-11

1989-05-30

Williams, Hezron E.

Measuring and testing

Gas analysis

Gas chromatography

G01N 3100

Patent

active

048339091

ABSTRACT:
The invention is directed to an apparatus for sensing a gaseous component in air and includes a housing having a flushing chamber through which an air sample can flow via a closeable inlet and a closeable outlet. The sensor is mounted in a measuring chamber above the flushing chamber and is hermetically sealed from its ambient not only during the time that the flushing chamber is flushed with the air sample; rather, and most important, during the measuring operation itself in order that any influences from a diffusion of the ambient air into the measuring chamber is prevented. For this purpose and to determine the sample quantity diffusing into the measuring chamber at the beginning of a specific period of time, the inlet as well as the outlet of the flushing chamber is closed while at the same time the diffusion passage interconnecting the two chambers is opened. After the time period has run, the diffusion passage is again closed.

REFERENCES:
patent: 3673853 (1972-07-01), Griswold et al.
patent: 3854320 (1974-12-01), Burroughs et al.
patent: 4384925 (1983-05-01), Stetter et al.
patent: 4627269 (1986-12-01), Forster et al.

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